I had some bad luck a couple of weeks ago, i gave it a mild road tune to get it driveable before it went on the dyno, it felt pretty strong, got it on the dyno and it was rich as expected as thats what i set up in my road tune, it went on the dyno and put down 437awkw (590awhp) on gate pressure (18psi). Given its a dyno dynamics (reads about 10-15% lower than a dynojet) and had the drivetrain loss of the awd, th400 and 6000rpm converter.
It developed a slight miss, we changed the plugs, the ones that came out looked fine except the one that had the miss was a touch darker. Put new plugs in and the miss cleared up, unfortunately 3 pulls later it melted cylinder 3, i suspect boiled fuel in the rail, it was ridiculously hot that day, i havnt disassembled it yet as i havnt had time but will be this weekend so i should know more by then. The data logs all look fine and there is nothing to indicate an issue, afr was 11.0, timing only 12-15 deg, boost 18psi, iat 40degC, coolant temp 89degC.
If i had egt probes i would have caught it in time.
I’ll replace pistons and whatever else is damaged, add egt probes to my manifold and im going to do a set of billet main caps while it’s out, it rolled off near 600awhp easily and assuming 150hp drivetrain loss through the awd and th400 thats getting up there by the time i add in another 10-15psi boost.
The awd setup is performing brilliantly, it just comes up onto the converter nearly immediately, pins the tacho at 6200rpm with full boost and holds it until roadspeed catches up, rev’s out to 8000 then pick another gear. Without the stock trac on it will spin the fronts or rears depending on the surface, with the trac on it touches the brakes on the spinning wheel and brings it back under control quickly and smoothly.